Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 5 mi or more and a ceiling of 3,000 ft or more. Only observations between sunrise and sunset are taken into account.
Marginal VFR conditions (%)
Month
Average
2024
2023
2022
2021
2020
January
81.3
69
84
85
79
75
February
81.7
71
80
82
80
87
March
76.7
63
71
74
80
93
April
77.6
70
67
76
63
82
May
78.8
55
86
80
79
81
June
86.0
60
99
94
90
88
July
83.8
81
67
61
93
83
August
80.8
100
86
83
74
September
80.9
81
89
80
72
October
76.2
74
62
75
80
November
79.4
71
80
77
89
December
71.6
47
66
78
79
Average
78.7
66.2
77.8
79.0
79.0
81.7
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 3⅛ mi or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.
Maximum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
-22.6
-20
-23
-26
-12
-22
February
-24.5
-22
-29
-26
-18
-24
March
-15.1
-13
-13
-16
-17
-16
April
-8.4
-6
-7
-8
-4
-8
May
0.3
0
1
0
1
-1
June
7.6
6
10
11
6
7
July
13.5
12
13
12
13
16
August
12.7
19
13
12
15
September
7.0
6
11
7
6
October
1.4
3
2
4
0
November
-8.8
-5
-7
-5
-8
December
-13.2
-10
-10
-12
-14
Average
-5.1
-8.3
-6.2
-5.2
-2.1
-5.9
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
-25.2
-22
-25
-29
-17
-26
February
-28.9
-26
-33
-30
-21
-27
March
-20.6
-15
-17
-19
-22
-21
April
-13.9
-10
-11
-12
-8
-12
May
-3.2
-2
-2
-3
-1
-3
June
3.4
3
5
6
2
3
July
8.6
8
9
6
9
11
August
8.0
11
8
8
10
September
3.4
2
7
3
3
October
-2.9
0
0
1
-2
November
-10.3
-8
-9
-7
-11
December
-16.0
-13
-14
-15
-17
Average
-9.4
-11.0
-10.7
-9.4
-6.3
-8.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
56.2
76
48
70
53
60
February
58.8
69
49
67
53
55
March
54.3
81
42
52
46
57
April
43.1
52
44
44
28
52
May
27.6
27
29
30
20
33
June
13.6
13
0
7
12
22
July
16.7
30
18
19
18
19
August
22.0
3
28
16
17
September
27.6
11
18
34
46
October
27.4
23
32
10
35
November
50.3
32
47
56
51
December
55.2
33
45
57
71
Average
38.1
52.5
28.8
38.4
31.5
41.7
Precipitation during daylight period
Percentage of observations with observed rain, drizzle, snow or hail. Only observations between sunrise and sunset are taken into account.
Wind speed (knots)
Month
Average
2024
2023
2022
2021
2020
January
12.8
16
12
12
11
14
February
12.8
13
13
14
13
12
March
13.6
15
13
14
12
15
April
13.3
12
11
14
11
16
May
13.9
16
16
15
14
14
June
13.7
15
10
13
16
13
July
12.9
16
11
13
14
11
August
13.9
7
14
16
12
September
12.7
11
11
14
11
October
13.7
16
17
13
13
November
13.4
14
15
13
15
December
13.3
10
13
15
15
Average
13.4
14.8
12.3
13.9
13.4
13.3
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
2020
January
290°
282°
279°
300°
287°
February
291°
293°
275°
276°
287°
March
019°
009°
290°
316°
282°
April
341°
012°
343°
029°
007°
May
039°
329°
004°
016°
332°
June
018°
029°
059°
329°
023°
July
018°
295°
043°
302°
001°
August
120°
288°
267°
008°
September
281°
246°
050°
054°
October
351°
301°
028°
280°
November
286°
316°
013°
290°
December
304°
017°
304°
252°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.